Tweak bug2355_revert at suggestion from Roger

changes/bug2355_revert

   o Minor bugfixes:
     - Revert the UseBridges option to its behavior before 0.2.2.28-beta.
       When we changed the default behavior to "use bridges if any are
-      listed in the torrc", we broke a number of Vidalia users.
+      listed in the torrc", we broke a number of users who had bridges
+      in their torrc files but who didn't actually want to use them.
       Partial resolution for bug 3354.